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Particle Image Velocimetry

Two-dimensional velocity measurements are made in a particle laden flow. A double pulsed laser sheet illuminates a two dimensional particle field. An imaging device takes a picture of the double exposed individual particles. Given a known pulse separation and a measured particle image separation, velocity values across the plane may be determined.

Typical Accuracy:

~5%


Requirements:

  • Ninety Degree Dual Optical Access
  • Seeding
  • Image Processing

Select Wind Tunnels:

  • BART
  • Counter Flow Diffusion Flame
  • Water Tunnel
  • Mach 6 Tunnel
  • Backward Facing Step


Potential Extensions:

We are currently examining Holographic PIV. This will allow the user to obtain three dimensional three component velocity data. Laboratory results look very promising.


Primary Limitations of PIV:

  • Seeding
  • Two-dimensional (potential for holographic recording)

Primary Advantages of PIV:

  • Maturity
  • Planar Measurements

 

   
 
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NASA Official: Lisa Le Vie
Page Curator: Lisa Le Vie
Last Updated: March 2022
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